Joint DIII-D/EAST research on the development of a high poloidal beta scenario for the steady state missions of ITER and CFETR

Garofalo, A. M.; Gong, X. Z.; Ding, S. Y.; Huang, J.; McClenaghan, J.; Pan, C. K.; Qian, J.; Ren, Q. L.; Staebler, G. M.; Chen, J.; Cui, L.; Grierson, B. A.; Hanson, J. M.; Holcomb, C. T.; Jian, X.; Li, G.; Li, M.; Pankin, A. Y.; Peysson, Y.; Zhai, X.; Bonoli, P.; Brower, D.; Ding, W. X.; Ferron, J. R.; Guo, W.; Lao, L. L.; Li, K.; Liu, H.; Lyv, B.; Xu, G.; Zang, Q.

doi:10.1088/1361-6587/aa8c9d

Joint DIII-D/EAST research on the development of a high poloidal beta scenario for the steady state missions of ITER and CFETR

Journal Article · Thu Nov 23 00:00:00 EST 2017 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aa8c9d· OSTI ID:1502029

^[1]; Gong, X. Z. ^[2]; ^[2]; Huang, J. ^[2]; McClenaghan, J. ^[3]; ^[2]; Qian, J. ^[2]; Ren, Q. L. ^[2]; Staebler, G. M. ^[2]; Chen, J. ^[2]; Cui, L. ^[4]; ^[4]; Hanson, J. M. ^[5]; Holcomb, C. T. ^[6]; Jian, X. ^[7]; ^[2]; Li, M. ^[2]; Pankin, A. Y. ^[6]; Peysson, Y. ^[8]; Zhai, X. ^[2] more »

General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
Oak Ridge Associated Univ., Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Columbia Univ., New York, NY (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Huazhong Univ. of Science and Technology, Wuhan (China)
Commissariat a l'Energie Atomique et aux Energies Alternatives (CEA), Saint-Paul-Les-Durance (France)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Plasma Science and Fusion Center
Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy

Experimental and modeling investigations on the DIII-D and EAST tokamaks show the attractive transport and stability properties of fully noninductive, high poloidal-beta (β_P) plasmas, and their suitability for steady-state operating scenarios in ITER and CFETR. A key feature of the high-β_P regime is the large-radius (r>0.6) internal transport barrier (ITB), often observed in all channels (ne, Te, Ti, rotation), and responsible for both excellent energy confinement quality and excellent stability properties. Experiments on DIII-D have shown that, with a largeradius ITB, very high β_N and β_P values (both≥4) can be reached by taking advantage of the stabilizing effect of a nearby conducting wall. Synergistically, higher plasma pressure provides turbulence suppression by Shafranov shift, leading to ITB sustainment independent of the plasma rotation. Experiments on EAST have been used to assess the long pulse potential of the high-β_P regime. Using RF-only heating and current drive, EAST achieved minute-long fully noninductive steady state H-mode operation with strike points on an ITER-like tungsten divertor. Improved confinement (relative to standard H-mode) and steady state ITB features are observed with a monotonic q-profile with q_min~1.5. Separately, experiments have shown that increasing the density in plasmas driven by lower hybrid wave broadens the q-profile, a technique that could enable a large radius ITB. These experimental results have been used to validate MHD, current drive, and turbulent transport models, and to project the high-β_P regime to a burning plasma. These projections suggest the Shafranov shift alone will not suffice to provide improved confinement (over standard H-mode) without rotation and rotation shear. However, increasing the negative magnetic shear (higher q on axis) provides a similar turbulence suppression mechanism to Shafranov shift, and can help devices such as ITER and CFETR achieve their steady-state fusion goals.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1502029

Alternate ID(s):: OSTI ID: 23001440

Report Number(s):: LLNL-JRNL--758197; 943646

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 1 Vol. 60; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Theoretical analysis of key factors achieving reversed magnetic shear q -profiles sustained with lower hybrid waves on EAST Zhai, X. M.; Xiang, N.; Chen, J. L. Plasma Physics and Controlled Fusion, Vol. 61, Issue 4 https://doi.org/10.1088/1361-6587/aaffe5	journal	February 2019
Progress of physics understanding for long pulse high-performance plasmas on EAST towards the steady-state operation of ITER and CFETR Huang, J.; Gong, X.; Garofalo, A. M. Plasma Physics and Controlled Fusion, Vol. 62, Issue 1 https://doi.org/10.1088/1361-6587/ab56a5	journal	December 2019
Integrated operation of steady-state long-pulse H-mode in Experimental Advanced Superconducting Tokamak Gong, X.; Garofalo, A. M.; Huang, J. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab1c7b	journal	July 2019
Improved high-performance fully non-inductive discharge by optimizing the fast-ion confinement on EAST Huang, J.; Qian, J. P.; Garofalo, A. M. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab443a	journal	October 2019
The dominant micro-turbulence instabilities in the lower q ₉₅ high β _p plasmas on DIII-D and predict-first extrapolation Ding, S.; Jian, X.; Garofalo, A. M. Nuclear Fusion, Vol. 60, Issue 1 https://doi.org/10.1088/1741-4326/ab5152	journal	November 2019

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